Tons of celebrities made sure they were in attendance for the Lakers' play-in game Tuesday night ... and they no doubt were glad they came -- 'cause L.A. won in an instant classic!!
Tennis legend John McEnroe had courtside seats for the playoff-clinching game with the Timberwolves at Crypto.com Arena -- as did Michael B. Jordan, Jimmy Iovine and Corey Gamble.
All were treated to a helluva contest ... as L.A. and Minnesota went back and forth for about three hours -- before LeBron James' squad came out on top in overtime, 108-102.